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Leases (Narrative) (Details)
$ in Millions
3 Months Ended
Mar. 31, 2019
USD ($)
Lessee, Lease, Description [Line Items]  
Lessee, lease, renewal term 10 years
Lessee, operating lease, lease not yet commenced, amount $ 515
Lessee, operating lease, lease not yet commenced, renewal term 10 years
Minimum  
Lessee, Lease, Description [Line Items]  
Lessee, operating lease, lease not yet commenced, term of contract 2 years
Maximum  
Lessee, Lease, Description [Line Items]  
Lessee, lease, remaining term of contract 15 years
Lessee, operating lease, lease not yet commenced, term of contract 18 years